Manufacture of lakes.



UNITE TATES PATENT oFFIoE.

ERNST ULRICHS, or ELBERF'ELD, GERMANY, AssIGNoia To THE FIRM on Wt'ILFING, DAHL AND COMPANY, A. G., on BARMEN, GERMANY.

MANUFACTURE or LAKES.

No Drawing.-

7 Specification of Letters Patent.

To all 'whom'it may concern:

Be it known that I, ERNST'ULRICHS, a

subject of the King of Prussia, German. Emperor, and resident of Elberfeld, Prov-. ince of the Rhine, German Empire, have 1n- My invention consists in the production of new lakes which are of a beautiful Bordeaux-red shade being at the same time distinguished by their resistance to water and alcohol and their insolubilityin oil as well as by the fast color, and high covering ca-' pacity as oil-colors.

The method of producing my new lakes consists in treating the monoazo dye produced from diazotized alpha-naphthylamiu and naphthol-sulfo-acid 1:4 with the salts of heavy metals as for instance calcium, barium, and thelike.

The dye produced from diazotized alphanaphthylamin and naphthol-sulfoacid 1:4 from which my new lakes are made, has already been made known by the German Patent 26012 of the year 1883 (English mentionedamonga series of other dyes, as for instance; azococcin 2R (xylidin and naphtholsulfoacid-1.4) azorubin- S or azo acid-rubin. (naphthionic acid and napht'holsulfoacid 1 :4), azococcin 7B or cloth red R (amidoazobenzene and naphtholsulfoacid 1.4), 'orseillin B. B. (amido-az'o-toluenesulfoacid and naphtholsulfoacid 1.4), each having naphtholsulfoacid 1:4 as one component thereof. \Vhile most of these dyes are very valuable for dyeing wool, etc., the dye produced from diazotized alpha-naphthylamin and i naphtholsulfo-acid L4, being practically insoluble in water, isof no value as a dye and therefore it hasnever been in the market. I have found, however that the calcium and barium salts, of this dye are of great importance for the manufacture "of colorlakes. This fact has been much surprising inasmuch as the other.

mono azo d es from naphtholsulfo-acid 1.4

mentioned a ove are valueless for the manu-' facture of lakes and as until now no other mono azo dyes from naphtholsulfoacid 1.4 have been practically. used for this pose. The United States Patent No.7 61123, it is true, describesv some dyes and lakes from amidoanthraquinone and; various There the dye isnaphtholsulfoacids among which also naph tholsulfoacid 1.4 is mentioned, but those dyes from anthraquinone proved to be of no importance for the manufacture of lakes. Moreover the unserviceableness of dyes from naphtholsulfoacid 1.4 for the manufacture of lakes has beenknown by the Gerinant Patent 161,424 (English Patent No. 4646/05).

This patent describes lakes from various dyes, one compound of which being Patented Jan. 9, 1 912.

Application filed June 1, 191L Serial No. 630,597. I

naphtholdisulfoacid 1.4.8 and the inventoriof them expressly declares that by replacing similar naphtholsulfoacid 1.4 the lakes produced are far less fast against light and of inferior quality.

All those mono azo dyesfrom naphtholsulfoacid mentioned being practically unadapted or unserviceable for useful colorlakes and having furthermore experienced that the dye produced from diazotized betanaphthyl-amin and naphtholsulfoacid 1.4 yields lakes which are dull, not fast against light, and therefore equally worthless, I was much surprised when I found that my new lakes-produced from diazotized alpha- 'thenaphtholdisulfoacid 1.4.8 by the very naphthylamin and naphtholsulfoacid 1.4

I were of so high quality. I

The'manner in which my lakes are obtained from the dye produced from diazotized'alpha-nap'hthylamin and naphtholsulfoacid 1.4 isv inusing the usual methods in order to obtain colorlakes from dyes sayas follows:

Example 1: A paste containing 2.5 kg.- of the ,dry sodium salt of. the dye diazotized alphanaphthylamin and naphtholsulfoacid 1.4 obtainedby known methods, is stirred with water. and 100 kg. of heavy spar.

'added; then a solution of kg. of calcium chlorid in 10 liters of water is added and boiled for a few minutes. The colorlake obtained is of a beautiful Bordeaux-red shade and the oil colors made from it are highly fast against light and of an excel lent covering capacit Example 2: The process is carried out exactly as in Example 1 but instead of g. kg. of calcium chlorid 1 kg. of barium chlorid is used. The barium lake obtained is of same quality but more bluish than the calcium lake obtained by Example 1.

In manufacturing my new lakes by the abdve processes instead of heavy spar, other substrata employed for colorlakes such as aluminium hydroxid, blanc fixe, etc., may be used. The manufacture of my new lakes may also be carried out undersuch conditions that the dyes form simultaneously with the precipitation of the lakes as shown in U. S. Patent No. 910,030.

I claim 1. A process for the manufacture of colorlakes which consists in treating the dye produced from diazotized alpha-naphthylamin and naphtholsulfo-acid 1.4:, with salts of heavy metals. v

2. As new articles of manufacture,'colorlakesobtained from the dye produced from diazotized K alpha-naphthylamin and naphtholsulfoacid 1:4, characterized by their Bordeaux-red shade, their resistance. to Water and alcohol, their insolubility in oil and their fast color against the action of light, yielding, upon reduction by means of tin and hydrochloric acid, alpha-naphthylamin and 2 amido 1 naphthol 4 sulfonic acid. 3. As a new article of manufacture, a color-lake obtained from the calcium. salt of'the dye produced from diazotized alphanaphthylamin and naplitholsulfoacid 1:4, characterized by its Bordeaux-red shade, its resistance to water and alcohol, its insolubility in oil and its fast color against the action of light, yielding, upon reduction by means of tin and hydrochloric acid, alphanaphthylamin and 2 amido l naphthol 4 sulfonic acid.

In Witness whereof I have hereunto set my hand in the presence of two witnesses.

ERNST ULRICHS. [a 8.]

Witnesses:

ALFRED HENKEL, ALBERT F. NIEFER. 

